The abscissa at the endpoint of an arc of a unit circle centered at the origin of a Cartesian coordinate system, the arc being of length x and measured counterclockwise from the point(1, 0)if x is positive or clockwise if x is negative.

 
  • 余弦以笛卡儿坐标系原点为圆心的单位圆的圆弦端点的横坐标,弧的长度为x,如果x为正,弧的长度则从(1,0)点按逆时针方向算起,若x为负,则按顺时针方向从(1,0)点算起
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